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Remove fexecve from netbsdlike as it's not implemented #1201

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merged 1 commit into from
Jan 15, 2019

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thendiscard
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Sometimes it causes confusion in downstream users of libc, for example it caused nix-rust/nix to fail to compile on OpenBSD 6.4 (see nix-rust/nix#1000).

OpenBSD doesn't implement fexecve. The only reference of it that I can
find in the OpenBSD source is in the man pages of signal(3) and
sigaction(2) (where it's mentioned that it is not implemented).

OpenBSD official source code link:
https://cvsweb.openbsd.org/src/lib/libc/sys/sigaction.2?rev=1.75&content-type=text/x-cvsweb-markup

OpenBSD Github mirror:
https://github.com/openbsd/src/blob/master/lib/libc/sys/sigaction.2#L619

On NetBSD's unistd.h I see that it is under an ifdef. Calling it returns
78 / ENOSYS / Function not implemented.

NetBSD office source code link:
http://cvsweb.netbsd.org/bsdweb.cgi/src/include/unistd.h?rev=1.151&content-type=text/x-cvsweb-markup&only_with_tag=MAIN

NetBSD Github mirror:
https://github.com/NetBSD/src/blob/trunk/include/unistd.h#L319

Tests on OpenBSD 6.4 after the change:

user@openbsd64 ~/RUST/libc $ cargo build
   Compiling libc v0.2.46 (/home/user/RUST/libc)
    Finished dev [unoptimized + debuginfo] target(s) in 3.88s

user@openbsd64 ~/RUST/libc $ cargo build --release
   Compiling libc v0.2.46 (/home/user/RUST/libc)
    Finished release [optimized] target(s) in 2.21s

user@openbsd64 ~/RUST/libc/libc-test $ cargo test
   Compiling proc-macro2 v0.4.24
   Compiling unicode-xid v0.1.0
   Compiling semver-parser v0.7.0
   Compiling serde v1.0.84
   Compiling libc v0.2.45
   Compiling num-traits v0.2.6
   Compiling ryu v0.2.7
   Compiling cfg-if v0.1.6
   Compiling itoa v0.4.3
   Compiling term v0.4.6
   Compiling bitflags v0.9.1
   Compiling cc v1.0.28
   Compiling libc v0.2.46 (/home/user/RUST/libc)
   Compiling log v0.4.6
   Compiling semver v0.9.0
   Compiling log v0.3.9
   Compiling rustc_version v0.2.3
   Compiling rand v0.4.3
   Compiling extprim v1.6.0
   Compiling quote v0.6.10
   Compiling syn v0.15.23
   Compiling serde_derive v1.0.84
   Compiling syntex_pos v0.59.1
   Compiling serde_json v1.0.34
   Compiling syntex_errors v0.59.1
   Compiling syntex_syntax v0.59.1
   Compiling ctest v0.2.8
   Compiling libc-test v0.1.0 (/home/user/RUST/libc/libc-test)
    Finished dev [unoptimized + debuginfo] target(s) in 2m 16s
     Running /home/user/RUST/libc/target/debug/deps/linux_fcntl-08861a7cd96d1b94
RUNNING ALL TESTS
PASSED 0 tests
     Running /home/user/RUST/libc/target/debug/deps/main-57e266d38aa58cce
RUNNING ALL TESTS
PASSED 7187 tests

I've tried running the tests on a NetBSD 8.0 box unfortunately there libc-test fails to compile even before this change.

OpenBSD doesn't implement fexecve. The only reference of it that I can
find in the OpenBSD source is in the man pages of signal(3) and
sigaction(2) (where it's mentioned that it is not implemented).

OpenBSD official source code link:
https://cvsweb.openbsd.org/src/lib/libc/sys/sigaction.2?rev=1.75&content-type=text/x-cvsweb-markup

OpenBSD Github mirror:
https://github.com/openbsd/src/blob/master/lib/libc/sys/sigaction.2#L619

On NetBSD's unistd.h I see that it is under an ifdef. Calling it returns
78 / ENOSYS / Function not implemented.

NetBSD office source code link:
http://cvsweb.netbsd.org/bsdweb.cgi/src/include/unistd.h?rev=1.151&content-type=text/x-cvsweb-markup&only_with_tag=MAIN

NetBSD Github mirror:
https://github.com/NetBSD/src/blob/trunk/include/unistd.h#L319
@rust-highfive
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Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @gnzlbg (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

Please see the contribution instructions for more information.

@gnzlbg
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gnzlbg commented Jan 13, 2019

What about bitrig ?

@thendiscard
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I've checked bitrig and specifically for fexecve the situation is the same as it is for OpenBSD, it is not implemented and the only occurrences in the source code are 2 man page references stating that it is not implemented: https://github.com/bitrig/bitrig/search?q=fexecve&unscoped_q=fexecve

I'm not familiar with bitrig but Wikipedia states that it is no longer under active development, and the latest commit in bitrig/bitrig (which is linked on bitrig.org) is from Jan. 2017. So, I'm not sure if it is worth to keep supporting it.

@gnzlbg
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gnzlbg commented Jan 15, 2019

@bors: r+

@bors
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bors commented Jan 15, 2019

📌 Commit 3ecdcff has been approved by gnzlbg

@bors
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bors commented Jan 15, 2019

⌛ Testing commit 3ecdcff with merge ac6e2a7...

bors added a commit that referenced this pull request Jan 15, 2019
Remove fexecve from netbsdlike as it's not implemented

Sometimes it causes confusion in downstream users of libc, for example it caused nix-rust/nix to fail to compile on OpenBSD 6.4 (see nix-rust/nix#1000).

OpenBSD doesn't implement fexecve. The only reference of it that I can
find in the OpenBSD source is in the man pages of signal(3) and
sigaction(2) (where it's mentioned that it is not implemented).

OpenBSD official source code link:
https://cvsweb.openbsd.org/src/lib/libc/sys/sigaction.2?rev=1.75&content-type=text/x-cvsweb-markup

OpenBSD Github mirror:
https://github.com/openbsd/src/blob/master/lib/libc/sys/sigaction.2#L619

On NetBSD's unistd.h I see that it is under an ifdef. Calling it returns
78 / ENOSYS / Function not implemented.

NetBSD office source code link:
http://cvsweb.netbsd.org/bsdweb.cgi/src/include/unistd.h?rev=1.151&content-type=text/x-cvsweb-markup&only_with_tag=MAIN

NetBSD Github mirror:
https://github.com/NetBSD/src/blob/trunk/include/unistd.h#L319

Tests on OpenBSD 6.4 after the change:
```bash
user@openbsd64 ~/RUST/libc $ cargo build
   Compiling libc v0.2.46 (/home/user/RUST/libc)
    Finished dev [unoptimized + debuginfo] target(s) in 3.88s

user@openbsd64 ~/RUST/libc $ cargo build --release
   Compiling libc v0.2.46 (/home/user/RUST/libc)
    Finished release [optimized] target(s) in 2.21s

user@openbsd64 ~/RUST/libc/libc-test $ cargo test
   Compiling proc-macro2 v0.4.24
   Compiling unicode-xid v0.1.0
   Compiling semver-parser v0.7.0
   Compiling serde v1.0.84
   Compiling libc v0.2.45
   Compiling num-traits v0.2.6
   Compiling ryu v0.2.7
   Compiling cfg-if v0.1.6
   Compiling itoa v0.4.3
   Compiling term v0.4.6
   Compiling bitflags v0.9.1
   Compiling cc v1.0.28
   Compiling libc v0.2.46 (/home/user/RUST/libc)
   Compiling log v0.4.6
   Compiling semver v0.9.0
   Compiling log v0.3.9
   Compiling rustc_version v0.2.3
   Compiling rand v0.4.3
   Compiling extprim v1.6.0
   Compiling quote v0.6.10
   Compiling syn v0.15.23
   Compiling serde_derive v1.0.84
   Compiling syntex_pos v0.59.1
   Compiling serde_json v1.0.34
   Compiling syntex_errors v0.59.1
   Compiling syntex_syntax v0.59.1
   Compiling ctest v0.2.8
   Compiling libc-test v0.1.0 (/home/user/RUST/libc/libc-test)
    Finished dev [unoptimized + debuginfo] target(s) in 2m 16s
     Running /home/user/RUST/libc/target/debug/deps/linux_fcntl-08861a7cd96d1b94
RUNNING ALL TESTS
PASSED 0 tests
     Running /home/user/RUST/libc/target/debug/deps/main-57e266d38aa58cce
RUNNING ALL TESTS
PASSED 7187 tests
```
I've tried running the tests on a NetBSD 8.0 box unfortunately there `libc-test` fails to compile even before this change.
@bors
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bors commented Jan 15, 2019

☀️ Test successful - checks-cirrus, checks-travis, status-appveyor
Approved by: gnzlbg
Pushing ac6e2a7 to master...

@bors bors merged commit 3ecdcff into rust-lang:master Jan 15, 2019
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4 participants